CN215284219U - Half shaft lever assembly - Google Patents

Abstract

The utility model provides a half shaft lever assembly, which comprises a first shaft lever, a second shaft lever, a connecting piece and a third shaft lever, wherein one end of the second shaft lever is connected with a fixed joint in an adaptive way, and the other end of the second shaft lever is inserted into the first shaft lever; a first fastener is detachably connected between the first shaft lever and the second shaft lever so as to restrain the second shaft lever from rotating in the first shaft lever; one end of the connecting piece is rotatably held in the first shaft rod, and the other end of the connecting piece passes through the shaft wall of the first shaft rod and is detachably connected to the third shaft rod; a second fastener is detachably connected between the connecting piece and the first shaft rod so as to inhibit the connecting piece from rotating in the first shaft rod; the second shaft rod and the third shaft rod are oppositely arranged so as to be matched and connected with the movable joint. Semi-axis axostylus axostyle assembly, be convenient for between first axostylus axostyle and the second axostylus axostyle to and be connected and dismantle between first axostylus axostyle and the third axostylus axostyle, and then be convenient for change semi-axis accessory, and do benefit to reduction cost of maintenance.

Description

Half shaft lever assembly

Technical Field

The utility model relates to an automobile parts technical field, in particular to semi-axis axostylus axostyle assembly.

Background

Usually, a fixed joint on a vehicle is tightly connected with a hub, a movable joint is tightly connected with a speed changer, and the fixed joint and the movable joint are connected through a half shaft lever assembly. In order to meet the requirements of wheel jumping and steering during normal running of the whole vehicle, the half shaft and shaft lever assembly needs to be slidable relative to the fixed joint or the movable joint.

And because the operating mode of half axle assembly is abominable, especially the fixed knot, in use not only bears the moment of torsion, and easy because of beating of half axle axostylus axostyle assembly and collide with external foreign matter to and splash and corrode by the greasy dirt, so appear the quality problem easily.

In order to improve the durability of the half shaft rod assembly and prevent the potential safety hazard caused by the fact that the half shaft rod in the half shaft rod assembly is separated from the fixed joint, the half shaft rod can only slide relative to the movable joint in design. However, this solution does not facilitate the replacement of the half-axle fitting, which results in high maintenance costs.

SUMMERY OF THE UTILITY MODEL

In view of this, the utility model aims at providing a half axle axostylus axostyle assembly to in change the half axle accessory.

In order to achieve the above purpose, the technical scheme of the utility model is realized like this:

a half shaft assembly comprising: a first shaft, a second shaft, a connector and a third shaft;

one end of the second shaft lever is connected with the fixed joint in an adaptive mode, and the other end of the second shaft lever is inserted into the first shaft lever; a first fastener is detachably connected between the first shaft and the second shaft and is used for inhibiting the second shaft from rotating in the first shaft; one end of the connecting piece is rotatably held close to the first shaft rod, and the other end of the connecting piece penetrates through the shaft wall of the first shaft rod and is detachably connected to the third shaft rod; a second fastener is detachably connected between the connecting piece and the first shaft rod and is used for inhibiting the connecting piece from rotating in the first shaft rod; the second shaft rod and the third shaft rod are oppositely arranged so as to be matched and connected with the movable joint.

Further, the connector has an extension extending along an axis to project out of the first shaft; a third fastener is removably coupled between the third shaft and the extension, the third fastener configured to inhibit axial movement of the extension relative to the third shaft.

Further, the extension section is screwed in the third shaft rod in a threaded manner; the third fastening member is disposed along a radial direction of the third shaft, and the third fastening member penetrates the third shaft and the extension section.

Further, the distance from the starting end of the extension section to the center line of the third fastener is integral multiple of the thread pitch of the external thread on the extension section.

Further, the connecting piece comprises a head part and a shaft shoulder; the head is rotatably retained within the first shaft; the shaft shoulder is formed at the joint of the head and the extension section; and when the third shaft rod is sleeved on the extension section and is kept fixedly connected, the end part of the third shaft rod is arranged on the shaft shoulder in an overhead mode.

Further, the head includes a body and a flange; the main body is accommodated in the first shaft rod and has a length extending along the axial direction of the first shaft rod; the flange plate is arranged close to the free end of the main body and fixedly connected to the outer part of the main body; the inner wall of the first shaft rod is provided with a blocking part which extends along the radial direction, and when the main body is accommodated in the first shaft rod, the blocking part is in clearance fit with the flange plate.

Further, the second fastening member is disposed along a radial direction of the first shaft, and the second fastening member penetrates the first shaft and the main body.

Further, the second shaft is mounted on the first shaft in a threaded manner.

Further, the second shaft rod comprises a shaft rod main body and a screwed part which are fixedly connected integrally; the outer diameter of the screwing part is larger than the diameter of the shaft rod main body; and the inner wall of the first shaft lever is provided with an internal thread which is in threaded connection with the threaded part.

Furthermore, a plurality of mounting through holes are formed in the first shaft rod, are positioned in an area covered by the internal thread and are arranged at intervals along the axial direction of the first shaft rod; the screwing part is provided with a through hole; the first fastening member penetrates the mounting through hole and the through hole.

Compared with the prior art, the utility model discloses following advantage has:

(1) the half shaft rod assembly of the utility model can connect the second shaft rod to one end of the first shaft rod by arranging the first shaft rod and the first fastener; through the connecting piece to and the second fastener, can connect the other end at first axostylus axostyle with the third axostylus axostyle, thereby be convenient for between first axostylus axostyle and the second axostylus axostyle, and be connected and dismantle between first axostylus axostyle and the third axostylus axostyle, and then do benefit to and change the half axle accessory, and do benefit to and reduce cost of maintenance, and have better result of use.

(2) The arrangement of the extension section is favorable for improving the connection effect between the connecting piece and the third shaft rod.

(3) The extension section and the third shaft rod are in threaded connection, so that the convenience of connection between the extension section and the third shaft rod is improved.

(4) The distance from the starting end of the extension section to the central line of the third fastener and the relationship between the threaded connection of the external thread are beneficial to the installation of the third fastener.

(5) The arrangement of the head part on the connecting piece is favorable for operating the connecting piece, the end part of the third shaft lever is propped against the shaft shoulder, the effect of the connecting piece in use is favorably improved, and the connecting piece is simple in structure and convenient to design and implement.

(6) The flange and the blocking part are arranged, so that the head of the connecting piece is prevented from being separated from the first shaft rod.

(7) The second shaft lever is installed on the first shaft lever in a threaded connection mode, so that the second shaft lever and the first shaft lever are convenient to connect and detach.

(8) The external diameter of screw thread portion is greater than the diameter of axostylus axostyle main part, not only can realize with be connected between the first axostylus axostyle, can also prevent the internal thread on the fish tail first axostyle, and has better result of use.

(9) The axial interval of first axostylus axostyle sets up a plurality of installation through-holes to and the setting that is equipped with the perforating hole on the spiro union portion, be convenient for adjust the length of whole semi-axis axostylus axostyle assembly, and do benefit to the commonality that improves semi-axis axostylus axostyle assembly.

Drawings

The accompanying drawings, which form a part hereof, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention without undue limitation. In the drawings:

FIG. 1 is a schematic structural view of a half shaft assembly according to an embodiment of the present invention;

FIG. 2 is a top view of FIG. 1;

FIG. 3 is a sectional view taken along line A-A of FIG. 2;

fig. 4 is a schematic structural diagram of the first shaft rod at two different viewing angles according to the embodiment of the present invention;

FIG. 5 is a sectional view taken along line B-B of FIG. 4;

fig. 6 is a schematic structural diagram of a second shaft rod at two different viewing angles according to an embodiment of the present invention;

FIG. 7 is a sectional view taken along line C-C of FIG. 6;

fig. 8 is a schematic structural diagram of a connecting member according to an embodiment of the present invention at two different viewing angles;

FIG. 9 is a sectional view taken along line D-D of FIG. 8;

fig. 10 is a schematic view of a third shaft according to an embodiment of the present invention at two different viewing angles;

FIG. 11 is a sectional view taken along line E-E in FIG. 10;

fig. 12 is a schematic structural view illustrating a cotter pin locked to a pin according to an embodiment of the present invention;

description of reference numerals:

1. a first shaft lever; 2. a second shaft lever; 3. a third shaft lever; 4. a first fastener; 5. a second fastener; 6. a third fastener; 7. a cotter pin; 8. a connecting member;

101. a first end; 102. an annular projection; 103. mounting a through hole; 104. a first mounting hole; 105. inserting holes;

201. a shaft body; 202. a screw connection part; 203. a through hole; 204. a third end; 205. a fourth end; 206. a first shoulder;

301. a third mounting hole; 302. a fifth end; 303. a second threaded hole; 304. a sixth terminal;

801. a main body; 802. a flange plate; 803. an extension section; 804. a second mounting hole; 805. a second shoulder; 806. a fourth mounting hole; 807. and an eighth end.

Detailed Description

It should be noted that, in the present invention, the embodiments and features of the embodiments may be combined with each other without conflict.

In the description of the present invention, it should be noted that, if terms indicating orientation or positional relationship such as "upper", "lower", "inner", "outer", etc. appear, they are based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the appearances of the terms "first" to "eighth," and the like, if any, are also intended for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In addition, in the description of the present invention, the terms "mounted," "connected," and "connecting" are to be construed broadly unless otherwise specifically limited. For example, the connection can be fixed, detachable or integrated; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. To those of ordinary skill in the art, the specific meaning of the above terms in the present invention can be understood in combination with the specific situation.

The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.

The embodiment relates to a half shaft rod assembly which comprises a first shaft rod 1, a second shaft rod 2, a connecting piece 8 and a third shaft rod 3. Wherein, the fixed festival of one end adaptation connection of second axostylus axostyle 2, the other end of second axostylus axostyle 2 inserts in the first axostylus axostyle 1. A first fastener 4 is detachably connected between the first shaft 1 and the second shaft 2, the first fastener 4 inhibiting rotation of the second shaft 2 within the first shaft 1.

In this embodiment, one end of the connecting member 8 is rotatably held in the first shaft member 1, and the other end of the connecting member 8 passes through the shaft wall of the first shaft member 1 and is detachably connected to the third shaft member 3. A second fastener 5 is detachably connected between the connecting member 8 and the first shaft 1, the second fastener 5 being configured to restrain the connecting member 8 from rotating within the first shaft 1. The second shaft 2 and the third shaft 3 are oppositely arranged to be matched with the movable joint.

One exemplary structure of the axle shaft assembly of the present embodiment is shown in fig. 1 to 3 based on the overall design concept as described above. Wherein, first axostylus axostyle 1 is the tube-shape, not only does benefit to reduce weight, and reduction in production cost, but also does benefit to NVH performance and the rigidity that promotes half axle axostylus axostyle assembly. For convenience of description, in the present embodiment, an end of the first shaft 1 connected to the second shaft 2 is referred to as a first end 101, and an end of the first shaft 1 connected to the connector 8 is referred to as a second end. Wherein, the second end and the fixed knot can be connected by adopting a conventional assembly mode.

Preferably, the second shaft 2 is threadedly mounted within the third shaft 3 to facilitate mounting and dismounting therebetween. In which the structure of the first shaft 1 is shown in fig. 4 and 5 and the structure of the second shaft 2 is shown in fig. 6 and 7. For convenience of description, an end of the second shaft rod 2 connected to the first end 101 is referred to as a third end 204, and an end connected to the fixed joint is referred to as a fourth end 205.

In specific implementation, the second shaft rod 2 includes a shaft rod main body 201 and a screw-threaded portion 202 that are integrally connected, as shown in fig. 6, the screw-threaded portion 202 in this embodiment is disposed at a third end 204 of the second shaft rod 2, and a peripheral wall of the screw-threaded portion 202 has a first external thread. In correspondence with the threaded connection 202, a first threaded bore with a first internal thread is formed in the inner wall of the first end 101 of the first shaft 1. By rotating the first shaft rod 1, the first external thread and the first internal thread on the screwing part 202 are screwed together, so that the connection between the first external thread and the first internal thread is realized.

In this embodiment, as shown in fig. 3 and 6, the outer diameter of the thread-engaging portion 202 is larger than the diameter of the shaft main body 201, and a first shoulder 206 is formed at the connection of the thread-engaging portion 202 and the shaft main body 201. So set up, not only can realize being connected between second axostylus axostyle 2 and the first axostylus axostyle 1, can also prevent the first internal thread on the first axostylus axostyle 1 of fish tail, and have better result of use.

Referring to fig. 3, 6 and 7, a plurality of mounting through holes 103 are formed in the first shaft 1, and the plurality of mounting through holes 103 are located in the region covered by the internal thread and are arranged at equal intervals in the axial direction of the first shaft 1. The first fastening member 4 is simultaneously inserted through one of the mounting through holes 103 and the corresponding through hole 203. The first fastening member 4 in this embodiment is preferably a pin, which is simple in structure, easy to install, and effective in use.

In this embodiment, through the position that first fastener 4 wore through installation through-hole 103, can change the length of whole half axle axostylus axostyle assembly, do benefit to and satisfy under the same platform, different car systems are to the demand of not half axle axostylus axostyle assembly length to improve half axle axostylus axostyle assembly's commonality. Of course, in specific implementation, the number of the installation through holes 103 can be increased or decreased according to specific use requirements.

Preferably, the distance between the central lines of two adjacent mounting through holes 103 is an integral multiple of the pitch of the first external thread, so as to ensure that each mounting through hole 103 and the corresponding through hole 203 can be aligned in the process of screwing in and screwing out the second shaft lever 2 in the first shaft lever 1, thereby facilitating the mounting of the first fastening piece 4 and facilitating the realization of accurate adjustment of the length of the half shaft lever assembly. For example, the distance between the center lines of two adjacent mounting through holes 103 is 15mm, which is ten times the pitch of the first external thread of 1.5 mm.

In addition, to enhance the effect of the first fastening member 4 in use, as shown in fig. 1, 2 and 12, the top of the pin in this embodiment has a pin head, and the bottom of the pin has a through hole radially disposed therethrough. With the first fastening member 4 inserted in the mounting through hole 103 and the corresponding through hole 203, the pin head abuts on the outer wall of the first shaft 1, and the bottom of the first fastening member 4 protrudes out of the first shaft 1. At this time, the first fastening member 4 is locked and fixed by inserting the cotter pin 7 into the through hole, and has the advantages of convenient implementation and good fixing effect.

The cotter 7 in this embodiment may be a mature product in the prior art. If the structure in fig. 12 is adopted, the cotter 7 has two insertion arms which are arranged in parallel due to bending, and the cotter 7 can be locked on the first fastener 4 due to the insertion arms being inserted in the through holes and then being bent outwards, thereby improving the using effect of the pin.

It is understood that, in the present embodiment, besides installing the cotter 7 in the through hole, other limiting structures may be adopted to restrain the second shaft 2 from rotating relative to the first shaft 1. In addition, in this embodiment, a pin may be directly used instead of the cotter pin 7 or the limiting structure, and at this time, the first fastening member 4 is in transition fit with the mounting through hole 103 and the through hole 203, so that the use requirement can be met. Besides, the first fastening member 4 in this embodiment may also adopt other fastening structures in the prior art besides the pin, as long as the use requirement can be met.

In this embodiment, the connecting member 8 has an extension 803 extending along the axis to project out of the first shaft 1. The connector 8 comprises a head rotatably retained within the first shaft 1, and a second shoulder 805, wherein the second shoulder 805 is formed at the junction of the head and the extension 803. Since the third shaft 3 is sleeved on the extension 803 and kept fixed, the end of the third shaft 3 is placed on the second shoulder 805. For convenience of description, in the present embodiment, an end of the link 8 connected to the second end of the first shaft 1 is referred to as a fifth end 302, and an end of the link 8 connected to the third shaft 3 is referred to as a sixth end 304.

In particular structure, as shown in fig. 3, 8, and 9, the head in the present embodiment includes a main body 801 and a flange 802. Wherein the main body 801 is received in the second end of the first shaft 1 and has a length extending in the axial direction of the first shaft 1, and the flange 802 is arranged near the free end of the main body 801 and is fixedly connected to the outside of the main body 801. Meanwhile, a blocking part extending in the radial direction is arranged on the inner wall of the first shaft lever 1, and when the main body 801 is accommodated in the first shaft lever 1, the blocking part is in clearance fit with the flange 802.

Here, the flange 802 and the blocking portion are disposed to facilitate preventing the head of the connecting member 8 from being disengaged from the first shaft 1, and to facilitate the head being restrained, thereby facilitating the connection and detachment between the extension 803 and the third shaft 3.

Structurally, in the present embodiment, the head is disposed at the fifth end 302 of the connecting member 8, and the flange 802 separates the head into two parts. Wherein the radial cross-section of the head portion to the left of the flange 802 in figure 8 is arranged as a regular hexagon to facilitate the mating of external operating members thereto for attachment and detachment. Of course, to facilitate rotation of the outer operating member operating link 8, the radial cross-section of the head on the left side of the flange 802 may take other non-circular shapes in this embodiment, in addition to a regular hexagon.

The blocking portion in this embodiment includes an annular protrusion 102 disposed on the end surface of the second end of the first shaft 1, and the middle of the annular protrusion 102 is formed with an insertion hole 105 for the main body 801 to pass through. When the body 801 is received inside the second end of the first shaft 1, the annular protrusion 102 and the flange 802 are in clearance fit, and the inner wall of the insertion hole 105 and the outer peripheral wall of the body 801 are also in clearance fit. So set up, can be convenient for rotate first axle lever 1 after second fastener 5 demolishs to do benefit to the dismantlement operation.

The second fastening member 5 is provided along the radial direction of the first shaft 1, and penetrates the first shaft 1 and the main body 801. Specifically, a first mounting hole 104 for passing the second fastening member 5 is provided at the second end of the first shaft rod 1, and a second mounting hole 804 is provided through the body 801 located on the right side of the flange 802. Preferably, the second fastening member 5 in this embodiment is a pin. The pin here is of the same construction as the pin described above, and is also provided with a pin head and a cotter pin 7.

It should be noted that, in order to prevent the first shaft lever 1 from being installed in a wrong way, in this embodiment, a mistake-proof mark may be provided on the first shaft lever 1. For example, the position of the first mounting hole 104 is marked with a yellow paint pen, and the position of the mounting through-hole 103 through which the second fastener 5 needs to be passed is marked with a white paint pen. Accordingly, a yellow paint pen mark is also provided at the second mounting hole 804 of the third shaft 3, and a white paint pen mark is provided at the through hole 203 of the second shaft 2. Here, mark with the lacquer pen mark, do benefit to and arrange the implementation, and the mistake proofing is effectual. Of course, other forms of marking, besides those using a paint pen marking, may be used to facilitate placement.

With continued reference to fig. 3 and 8, in this embodiment, the extension 803 is threaded into the third shaft 3. Here, the structure of the third shaft 3 is shown in fig. 10 and 11, where an end of the third shaft 3 connected to the extension 803 is referred to as a seventh end, and an end of the third shaft 3 connected to the moving joint is referred to as an eighth end 807. Wherein the eighth end 807 and the movable joint can be connected by conventional assembling method.

In this embodiment, a second external thread is provided on the outer peripheral wall of the extension 803, and a second threaded hole 303 having a second internal thread is provided at the seventh end of the third shaft 3. Here, the extension 803 and the third shaft 3 are connected by a screw connection, which facilitates the installation and detachment of the two.

In addition, as shown in fig. 3, a third fastener 6 is detachably connected between the third shaft 3 and the extension 803, the third fastener 6 inhibiting axial movement of the extension 803 with respect to the third shaft 3. Specifically, as shown in fig. 9 and 10, a third mounting hole 301 penetrating in the radial direction is provided at the seventh end of the third shaft 3, and a fourth mounting hole 806 penetrating in the radial direction is provided in the extension 803.

In specific implementation, the distance from the starting end of the extension 803 to the center line of the third fastening member 6, that is, the center line of the fourth mounting hole 806, is an integral multiple of the thread pitch of the external thread on the extension 803. So configured, it is beneficial to ensure that after the extension 803 and the second threaded hole 303 are screwed into place, the third mounting hole 301 and the fourth mounting hole 806 can be aligned, thereby facilitating the installation of the third fastener 6. For example, the distance from the starting end of the extension 803 to the center line of the fourth mounting hole 806 in this embodiment is 15mm, which is ten times the pitch of the second external thread on the extension 803, which is 1.5 mm.

In specific implementation, the third fastening member 6 in this embodiment is a pin, and the structure of the pin and the structure of the cotter pin 7 are the same as those of the above-mentioned pin, and will not be described again here.

When the axle shaft assembly in this embodiment is assembled, the connecting member 8 is first installed at the second end of the first axle shaft 1, and the extension 803 extends out of the insertion hole 105 in the middle of the annular protrusion 102; then, through the screw connection of the first external thread on the extension section 803 and the second threaded hole 303 on the third shaft lever 3, until the second shoulder 805 abuts against and is matched with the end face of the seventh end of the third shaft lever 3; then, the third fastening member 6 is inserted into the third mounting hole 301 and the fourth mounting hole 806, the cotter pin 7 is inserted into the through hole at the bottom end of the third fastening member 6 and then locked, the second fastening member 5 is inserted into the first mounting hole 104 and the second mounting hole 804, and the cotter pin 7 is inserted into the through hole at the bottom end of the second fastening member 5 and then locked, thereby realizing the connection between the first shaft lever 1 and the third shaft lever 3.

Then, the first external thread on the second shaft lever 2 is connected with the first threaded hole on the first shaft lever 1 in a threaded manner, the mounting through hole 103 and the through hole 203 which are adjusted in place are aligned, at the moment, the first fastening piece 4 is inserted into the mounting through hole 103 and the through hole 203, the split pin 7 is inserted into the through hole at the bottom end of the first fastening piece 4 and then locked, and therefore the first shaft lever 1 and the second shaft lever 2 are connected.

When the axle shaft assembly in the embodiment is disassembled, the cotter pins 7 on the first fastening piece 4 and the second fastening piece 5 are disassembled, and the first fastening piece 4 and the second fastening piece 5 are removed. Then rotate first axostylus axostyle 1 to dismantle second axostylus axostyle 2 from first axostylus axostyle 1, at this moment, can dismantle first axostylus axostyle 1 from the fixed knot, the remaining part of fixed knot also can be dismantled. Then, the cotter 7 and the third fastener 6 on the third fastener 6 are disassembled, the first shaft lever 1 can be removed by rotating the head, and the rest parts of the movable joint can also be disassembled.

The half shaft lever assembly of the embodiment can connect the second shaft lever 2 to one end of the first shaft lever 1 by arranging the first shaft lever 1 and the first fastener 4; and the third shaft lever 3 can be connected to the other end of the first shaft lever 1 through the connecting member 8 and the second fastening member 5, thereby facilitating the connection and the disconnection between the first shaft lever 1 and the second shaft lever 2, and between the first shaft lever 1 and the third shaft lever 3. When the fixed knot needs maintenance because of the operating mode is abominable, be convenient for change half axle accessory to do benefit to and reduce cost of maintenance, and have better result of use.

The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. A half shaft assembly, comprising: a first shaft lever (1), a second shaft lever (2), a connecting piece (8) and a third shaft lever (3);

one end of the second shaft lever (2) is connected with the fixed joint in an adaptive manner, and the other end of the second shaft lever (2) is inserted into the first shaft lever (1);

a first fastening piece (4) is detachably connected between the first shaft (1) and the second shaft (2), and the first fastening piece (4) is used for inhibiting the second shaft (2) from rotating in the first shaft (1);

one end of the connecting piece (8) is rotatably held in the first shaft lever (1), and the other end of the connecting piece (8) passes through the shaft wall of the first shaft lever (1) and is detachably connected to the third shaft lever (3);

a second fastening piece (5) is detachably connected between the connecting piece (8) and the first shaft rod (1), and the second fastening piece (5) is used for inhibiting the connecting piece (8) from rotating in the first shaft rod (1);

the second shaft lever (2) and the third shaft lever (3) are arranged oppositely to be matched and connected with a movable joint.

2. The axle shaft assembly of claim 1, wherein:

the connecting piece (8) has an extension (803) extending along an axis to project out of the first shaft (1);

a third fastener (6) is detachably connected between the third shaft (3) and the extension (803), the third fastener (6) being configured to inhibit axial movement of the extension (803) relative to the third shaft (3).

3. The axle shaft assembly of claim 2, wherein:

the extension section (803) is screwed in the third shaft lever (3) in a threaded manner;

the third fastening member (6) is disposed along a radial direction of the third shaft (3), and the third fastening member (6) penetrates the third shaft (3) and the extension (803).

4. The axle shaft assembly of claim 3, wherein: the distance from the initial end of the extension section (803) to the central line of the third fastener (6) is integral multiple of the thread pitch of the external thread on the extension section (803).

5. The axle shaft assembly of any one of claims 2 to 4, wherein:

the connecting piece (8) comprises a head part and a shaft shoulder;

the head being rotatably held within the first shaft (1);

the shoulder is formed at the junction of the head and the extension (803);

because the third shaft lever (3) is sleeved on the extension section (803) and is kept fixedly connected, the end part of the third shaft lever (3) is arranged on the shaft shoulder in an overhead mode.

6. The axle shaft assembly of claim 5, wherein:

the head comprises a body (801) and a flange (802);

the body (801) is accommodated in the first shaft (1) and has a length arranged along the axial extension of the first shaft (1);

the flange plate (802) is arranged close to the free end of the main body (801) and is fixedly connected to the outer part of the main body (801);

the inner wall of the first shaft lever (1) is provided with a blocking part which extends along the radial direction, and when the main body (801) is accommodated in the first shaft lever (1), the blocking part is in clearance fit with the flange plate (802).

7. The axle shaft assembly of claim 6, wherein:

the second fastening member (5) is disposed along a radial direction of the first shaft (1), and the second fastening member (5) penetrates the first shaft (1) and the main body (801).

8. The axle shaft assembly of claim 1, wherein: the second shaft (2) is mounted on the first shaft (1) in a screwed manner.

9. The axle shaft assembly of claim 1 or 8, wherein:

the second shaft lever (2) comprises a shaft lever main body (201) and a screwed part (202) which are integrally and fixedly connected;

the outer diameter of the threaded part (202) is larger than the diameter of the shaft rod main body (201);

the inner wall of the first shaft lever (1) is provided with an internal thread screwed with the screwing part (202).

10. The axle shaft assembly of claim 9, wherein:

a plurality of mounting through holes (103) are formed in the first shaft lever (1), and the mounting through holes (103) are located in an area covered by the internal thread and are arranged along the axial direction of the first shaft lever (1) at intervals;

the screw joint part (202) is provided with a through hole (203);

the first fastening member (4) penetrates the mounting through-hole (103) and the through-hole (203).

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